I think I answered my own question on this one. .. Using LIGHTBLEND with an image that has black in the background as the mask areas, shows those areas as transparent (because obviously it adds nothing to the underlying colors). Similarly I would expect SHADEBLEND does the same using a white background for masking.
I however couldn't get LIGHTBLEND|SHADEBLEND to do anything. You might think that adding a value and then multiplying a value wouldn't cancel itself out, but it just doesn't draw, so I guess the mode number produced is just out of range and ignored.
Nice that you can add a tint with SetColor, though.
I however couldn't get LIGHTBLEND|SHADEBLEND to do anything. You might think that adding a value and then multiplying a value wouldn't cancel itself out, but it just doesn't draw, so I guess the mode number produced is just out of range and ignored.
Nice that you can add a tint with SetColor, though.